<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>

	<body>
		<a href="https://www.baidu.com">This is a link</a>
		<br />
		<button onmouseenter="alert('oh, on')">this</button>
		<br />
		<button onmouseenter="alert('oh, on')">that</button>

		<iframe src="http://www.cnblogs.com"></iframe>
		<script>
			var d=new Date();
			alert(d.getFullYear());
		</script>
	</body>
</html>
